Many automotive shops and dealers have a special device called " smoke machine" to test the EVAP system for leaks. rust damage of the fuel tank, filler neck or EVAP hose cracked EVAP line or ripped EVAP rubber hose faulty vent valve solenoid (canister close valve) rust on the fuel cap sealing surface of the fuel filler neck If the problem is caused by blockage in the EVAP vent valve or hose, the car might be difficult to fill with gas. In some cars, the warning about fuel cap being loose may also appear on the dash. In some cases, you might notice a faint gasoline smell when the car is parked in a garage. With this code there might be no symptoms other than the Check Engine light. The code P0442 indicates that the engine computer (PCM) has detected a small leak in the EVAP system. As you drive and conditions allow, the engine computer (PCM) tests the EVAP system for leaks by monitoring pressure or vacuum inside the system. The purpose of the EVAP System is to prevent fuel vapors inside the fuel tank from releasing in to the atmosphere. Home > Check Engine light > P0442 P0442 EVAP System Leak Detected (Small Leak): causes, symptoms, diagnostic Signs of automatic transmission problems.How to check the engine when buying a used car.How to get the best deal on a used car?.Buying a Used Car: 10 Common Mistakes to Avoid.
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